<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  </head>
  <body>
    <style>
      /* 标签h1 1*/
      /* 1 */
      /* h2 {
        color: blue;
      } */

      body * {
        background-color: red;
      }
    </style>
    <input type="text" />
    <input type="hidden" />
    <article>
      <h2>
        <span> yahoo </span>
      </h2>
      <h3>tom</h3>
    </article>
  </body>
</html>
